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Hi,
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Some people solved their knob problem with a little lubricating oil or WD-40 or petrol (I don't recommend petrol, cause their may be heat and petrol can ignite the knob... LOL)Since I can't get any petrol or other similar lubricants, I used a lubricant made by mixing coconut oil and kerosene which was there in my store room and it worked like a charm.

Are your sound drivers up to date? Have you checked the speaker connection? If not, as per the Acer service manual, you should check the connection, following all safety precautions. If the speakers still refuse to work, you should look at replacing them.

The audio jack on the laptop is for headphones and most likely cannot it cannot deliver sufficient power to drive unpowered speakers.
Check the audio jack with headphones, if the volume setting is high and you still can't get sounds from the headphone and the mute switch is not selected then the audio amp in the laptop is faulty.

Speaker issue desktop's only
1. Plug USB into USB port (any)2. Plug Black speak cable into LIGH GREEN (NOT BLACK) connector3. You will see a popup window - make sure it is on Front Speaker out4. Click OK - you will a cartoon computer with speakers on either side -then click on one of the
speakers to test5. if that does not work then follow this:
Reinstalling apps:
1. If in Windows - Start - Programs - Acer Empowering Technology - Acer E-recovery management -
click on Restore at bottom then "Reinstall apps and drivers" - look for hardware drivers that you
need. Click "install now"